diff --git a/src/daemon/rrset-factory.cpp b/src/daemon/rrset-factory.cpp
index 2830dac..9757abc 100644
--- a/src/daemon/rrset-factory.cpp
+++ b/src/daemon/rrset-factory.cpp
@@ -27,12 +27,12 @@
 
 NDNS_LOG_INIT("RrsetFactory")
 
-RrsetFactory::RrsetFactory(const std::string& dbFile,
+RrsetFactory::RrsetFactory(const boost::filesystem::path& dbFile,
                            const Name& zoneName,
                            KeyChain& keyChain,
                            const Name& inputDskCertName)
   : m_keyChain(keyChain)
-  , m_dbFile(dbFile)
+  , m_dbFile(dbFile.string())
   , m_zone(zoneName)
   , m_dskCertName(inputDskCertName)
   , m_checked(false)
diff --git a/src/daemon/rrset-factory.hpp b/src/daemon/rrset-factory.hpp
index 083b8a5..e6c5455 100644
--- a/src/daemon/rrset-factory.hpp
+++ b/src/daemon/rrset-factory.hpp
@@ -31,6 +31,7 @@
 
 #include <vector>
 #include <string>
+#include <boost/filesystem.hpp>
 
 namespace ndn {
 namespace ndns {
@@ -50,7 +51,7 @@
   };
 
 public:
-  RrsetFactory(const std::string& dbFile,
+  RrsetFactory(const boost::filesystem::path& dbFile,
                const Name& zoneName,
                KeyChain& keyChain,
                const Name& inputDskCertName);